Add a way to opt out of filesystem reorganization.

[cydia.git] / cydo.cpp

diff --git a/cydo.cpp b/cydo.cpp
index 458361620c08e33a8abf8cacb622e97f45bc4a9b..168d3c8a16239a68d0051c439839f35343feff02 100644 (file)
--- a/cydo.cpp
+++ b/cydo.cpp
@@ -1,9 +1,125 @@
+/* Cydia - iPhone UIKit Front-End for Debian APT
+ * Copyright (C) 2008-2015  Jay Freeman (saurik)
+*/
+
+/* GNU General Public License, Version 3 {{{ */
+/*
+ * Cydia is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Cydia is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Cydia.  If not, see <http://www.gnu.org/licenses/>.
+**/
+/* }}} */
+
+#include <cstdio>
+#include <cstdlib>
+
+#include <errno.h>
+#include <sysexits.h>
 #include <unistd.h>
 
+#include <launch.h>
+
+#include <Menes/Function.h>
+
+typedef Function<void, const char *, launch_data_t> LaunchDataIterator;
+
+void launch_data_dict_iterate(launch_data_t data, LaunchDataIterator code) {
+    launch_data_dict_iterate(data, [](launch_data_t value, const char *name, void *baton) {
+        (*static_cast<LaunchDataIterator *>(baton))(name, value);
+    }, &code);
+}
+
 int main(int argc, char *argv[]) {
+    auto log(fopen("/tmp/cydia.log", "a+"));
+    fprintf(log, "cydo:");
+    for (int arg(1); arg < argc; ++arg)
+        fprintf(log, " %s", argv[arg]);
+    fprintf(log, "\n");
+
+    auto request(launch_data_new_string(LAUNCH_KEY_GETJOBS));
+    auto response(launch_msg(request));
+    launch_data_free(request);
+
+    _assert(response != NULL);
+    _assert(launch_data_get_type(response) == LAUNCH_DATA_DICTIONARY);
+
+    auto parent(getppid());
+
+    auto cydia(false);
+
+    launch_data_dict_iterate(response, [=, &cydia](const char *name, launch_data_t value) {
+        if (launch_data_get_type(response) != LAUNCH_DATA_DICTIONARY)
+            return;
+
+        auto integer(launch_data_dict_lookup(value, LAUNCH_JOBKEY_PID));
+        if (integer == NULL || launch_data_get_type(integer) != LAUNCH_DATA_INTEGER)
+            return;
+
+        auto pid(launch_data_get_integer(integer));
+        if (pid != parent)
+            return;
+
+        auto variables(launch_data_dict_lookup(value, LAUNCH_JOBKEY_ENVIRONMENTVARIABLES));
+        if (variables != NULL && launch_data_get_type(variables) == LAUNCH_DATA_DICTIONARY) {
+            auto dyld(false);
+
+            launch_data_dict_iterate(variables, [&dyld](const char *name, launch_data_t value) {
+                if (strncmp(name, "DYLD_", 5) == 0)
+                    dyld = true;
+            });
+
+            if (dyld)
+                return;
+        }
+
+        auto string(launch_data_dict_lookup(value, LAUNCH_JOBKEY_PROGRAM));
+        if (string == NULL || launch_data_get_type(string) != LAUNCH_DATA_STRING) {
+            auto array(launch_data_dict_lookup(value, LAUNCH_JOBKEY_PROGRAMARGUMENTS));
+            if (array == NULL || launch_data_get_type(array) != LAUNCH_DATA_ARRAY)
+                return;
+            if (launch_data_array_get_count(array) == 0)
+                return;
+
+            string = launch_data_array_get_index(array, 0);
+            if (string == NULL || launch_data_get_type(string) != LAUNCH_DATA_STRING)
+                return;
+        }
+
+        auto program(launch_data_get_string(string));
+        if (program == NULL)
+            return;
+
+        if (strcmp(program, "/Applications/Cydia.app/Cydia") == 0)
+            cydia = true;
+    });
+
+    if (!cydia) {
+        fprintf(stderr, "thou shalt not pass\n");
+        return EX_NOPERM;
+    }
+
+    fflush(log);
+    fclose(log);
+
     setuid(0);
     setgid(0);
-    argv[0] = "/usr/bin/dpkg";
+
+    if (argc < 2 || argv[1][0] != '/')
+        argv[0] = "/usr/bin/dpkg";
+    else {
+        --argc;
+        ++argv;
+    }
+
     execv(argv[0], argv);
-    return 1;
+    return EX_UNAVAILABLE;
 }